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参数资料
| 型号： | FAN6863WTY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTLR GREEN MODE 6-SSOT |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 60kHz ~ 68kHz |
| 输入电压： | 7.5 V ~ 20 V |
| 输出电压： | 13.5V |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | 6-SSOT |
| 包装： | 标准包装 |
| 其它名称： | FAN6863WTYDKR |
Operation Description
Startup Operation
Figure 24 shows a typical startup circuit and transformer
auxiliary winding for a typical application. Before
switching operation begins, FAN6863W consumes only
startup current (typically 8 μA) and the current supplied
through the startup resistor charges the V DD capacitor
(C DD ). When V DD reaches turn-on voltage of 16 V (V DD-
ON ), switching begins and the current consumed
increases to 2 mA. Power is then supplied from the
transformer auxiliary winding. The large hysteresis of
V DD (7 V) provides more holdup time, which allows using
a small capacitor for V DD . The startup resistor is typically
connected to VAC line for a fast reset of latch protection.
Figure 25. PWM Frequency
Figure 24. Startup Circuit
Green-Mode Operation
The FAN6863W uses feedback voltage (V FB ) as an
indicator of the output load and modulates the PWM
frequency, as shown in Figure 25, such that the
switching frequency decreases as load decreases. In
heavy load conditions, the switching frequency is
65 kHz. Once V FB decreases below V FB-N (2.5 V), the
PWM frequency starts to linearly decrease from 65 kHz
to 22.5 kHz to reduce the switching losses. As V FB
decreases below V FB-G (2.2 V), the switching frequency
is fixed at 22.5 kHz and the FAN6863W enters “deep”
Green Mode, where the operating current decreases to
Figure 26. Burst-Mode Operation
Frequency Hopping
EMI reduction is accomplished by frequency hopping,
which spreads the energy over a wider frequency range
than the bandwidth measured by the EMI test
equipment. An internal frequency-hopping circuit
changes the switching frequency between 61 kHz and
69kHz with a period of 4.4 ms, as shown in Figure 27.
The frequency hopping function covers the whole
frequency range and shrinks the period with operation
frequency proportionally.
600 μA (maximum), further reducing the standby power
consumption. As V FB decreases below V FB-ZDC (1.6 V),
FAN6863W enters Burst-Mode operation. When V FB
drops below V FB-ZDC , switching stops and the output
voltage starts to drop, which causes the feedback
voltage to rise. Once V FB rises above V FB-ZDC , switching
resumes. Burst Mode alternately enables and disables
switching, thereby reducing switching loss in Standby
Mode, as shown in Figure 26.
Figure 27. Frequency Hopping
? 2011 Fairchild Semiconductor Corporation
FAN6863W ? Rev. 1.0.2
11
www.fairchildsemi.com
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相关代理商/技术参数 |
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| FAN6920 | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN6920MR | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Controller |
| FAN6920MRMY | 功能描述:电流型 PWM 控制器 Crtcl Mode PFC &QRes Crnt Mode PWM Cntrlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FAN6921 | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN6921AMLMY | 功能描述:电流型 PWM 控制器 PFC/Quasi-Resonant PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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